秸秆改良材料对沙质土壤饱和含水量的影响

Effect of Straw-bentonite-PAM Improved Material on Saturated Water Content in Sandy Soil

为提高沙质土壤饱和含水量,以作物秸秆为主材,以膨润土和聚丙烯酰胺(PAM)为添加剂配制沙质土壤改良材料,采用模拟试验研究秸秆改良材料不同配比、施用量与时间等因素对沙质土壤饱和含水量的影响。结果表明:施加秸秆改良材料可以增加沙质土壤饱和含水量,不同秸秆改良材料改良效果不同,且随着改良材料施用量、配方中PAM含量(<2%)的增加、土培时间(<60天)的延长,沙质土壤饱和含水量呈现增加趋势;添加剂量为10 g/kg,配方中PAM含量为2%的麦秆改良材料的土样,在土培60天后,饱和含水量为52.6%,是对照的2.32倍,对沙质土壤团粒结构改良效果最为明显。可见,添加秸秆改良材料可以增加沙质土壤饱和含水量。

A simulation experiment was carried out to increase sandy soil’s saturated water contents.We designed the improved material which was made of straw,bentonite and PAM,and investigated the effects of different improved material,the content of PAM in improved material and the cultivated time.The results indicated that： the saturated water contents of sandy soil increased in the presence of improved material,and would be different with different improved materials,and also increased with the content of improved material,PAM（2%） and the cultivated time（60 days） approximately.Compared with the others,the treatments amended by wheat straw（the amount was 10 g/kg,the proportion of PAM was 2%）,with 60 days cultivated time,its saturated water contents became 52.6%（2.32 times as the control）,showed the optimal results.